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X-WR-CALDESC:Events for ALOP
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DTSTART;TZID=Europe/Berlin:20210503T160000
DTEND;TZID=Europe/Berlin:20210503T170000
DTSTAMP:20210415T120317Z
CREATED:20210415T120317Z
LAST-MODIFIED:20210415T120317Z
UID:5504-1620057600-1620061200@alop.uni-trier.de
SUMMARY:ALOP-Colloquium with Prof. Dr. Bijan Mohammadi\, Montpellier University
DESCRIPTION:On Monday\, May 3\, 2021 at 16:00 c.t. Prof. Dr. Bijan Mohammadi\, Montpellier University\, will present his recent work at our colloquium.  He will speak about \nVariational nearshore dynamics  \nAbstract: \nMinimization principles are used in fluid-structure coupling to model sandy sea beds  evolution.The sandy bed is seen as a structure with low stiffness. We start with a model problem featuring the behavior of the coupling.Then water motion in shallow domains is described by the Saint Venant equations.This coupling bringing the bottom sea changes is based on the assumption that the bed adapts  to the flow in order to minimize some energy quantity togetherwith  minimal  sand transport.  The choice of the functional permits to include different physical quantities one think to play a role in the bottom morphodynamics.Hence\, the approach is also a tool for validating different modelling hypothesis.We also present tentative  direct and reverse uncertainty propagation procedures under the constraint of keeping the computational costcomparable to deterministic simulations.The different ingredients will be illustrated through coastal engineering applications.   \n  \nThe presentation will take place via Zoom. A link will be email prior to the event.\n \nIf you wish to receive a link and invitation to this presentation\, please send an email to shawATuni-trier.de
URL:https://alop.uni-trier.de/event/alop-colloquium-with-prof-dr-bijan-mohammadi-montpellier-university/
CATEGORIES:Colloquium
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20210505T120000
DTEND;TZID=Europe/Berlin:20210505T130000
DTSTAMP:20210408T074050Z
CREATED:20210408T071458Z
LAST-MODIFIED:20210408T074050Z
UID:5484-1620216000-1620219600@alop.uni-trier.de
SUMMARY:ALOP member Carina Costa to speak during the Research Seminar
DESCRIPTION:ALOP member Carina Costa will speak during the research seminar on May 5\, 2021 on the topic of \nAn Alternating Method for Cardinality-Constrained Optimization \nPlease join as via ZOOM at 12:15 . The link will be distributed via Email.
URL:https://alop.uni-trier.de/event/alop-member-carina-costa-to-speak-during-the-research-seminar/
CATEGORIES:Presentation
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20210510T160000
DTEND;TZID=Europe/Berlin:20210510T170000
DTSTAMP:20210505T075734Z
CREATED:20210308T100440Z
LAST-MODIFIED:20210505T075734Z
UID:5358-1620662400-1620666000@alop.uni-trier.de
SUMMARY:ALOP-Colloquium with Pascal Van Hentenryck\, Georgia Tech
DESCRIPTION:On Monday\, May 10\, 2021\, Prof. Dr. Pascal Van Hentenryck\, Georgia Tech will present his recent research titled: \nDifferential privacy of hierarchical Census data: An optimization approach  \nThis talk considers applications of a Census Bureau interested in releasing aggregate socio-economic data about a large population without revealing sensitive information about any individual. The released information can be the number of individuals living alone\, the number of cars they own\, or their salary brackets. Recent events have identified some of the privacy challenges faced by these organizations. To address them\, we present a novel differential-privacy mechanism for releasing hierarchical counts of individuals. The counts are reported at multiple granularities (e.g.\, the national\, state\, and county levels) and must be consistent across all levels. The core of the mechanism is an optimization model that redistributes the noise introduced to achieve differential privacy in order to meet the consistency constraints between the hierarchical levels. The key technical contribution of the paper shows that this optimization problem can be solved in polynomial time by exploiting the structure of its cost functions. Experimental results on very large\, real datasets show that the proposed mechanism provides improvements of up to two orders of magnitude in terms of computational efficiency and accuracy with respect to other state-of-the-art techniques. The talk also discusses various fairness issues arising in using differential privacy in downstream applications and how they can be mitigated. \nJoint work with Ferdinando Fioretto and Keyu Zhu \n  \nThis presentation will take place via Zoom. A link to participate in this presentation will be mailed shortly before the event. \nIf you wish to participate and receive and inviation\, please send an email to shawATuni-trier.de.
URL:https://alop.uni-trier.de/event/alop-colloquium-with-prof-dr-pascal-van-hentenryck-georgia-tech/
CATEGORIES:Colloquium
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20210517T160000
DTEND;TZID=Europe/Berlin:20210517T170000
DTSTAMP:20210427T082855Z
CREATED:20210426T081448Z
LAST-MODIFIED:20210427T082855Z
UID:5531-1621267200-1621270800@alop.uni-trier.de
SUMMARY:ALOP-Kolloquium with Oliver Stein\, Karlsruher Institut für Technologie (KIT)
DESCRIPTION:On Monday\, May 17\, 2021 at 16:00 c.t. Prof. Dr. Oliver Stein\, Karlsruher Institut für Technologie (KIT) will present his recent work at our colloquium titled:  \nThe granularity concept in mixed-integer optimization \nGranularity is a geometrically motivated concept which relaxes the difficulties imposed by integrality \nconditions and often provides ways for determining good feasible points of mixed-integer optimization problems \nat low computational cost. \nWe explain how this concept leads to algorithms for the computation of feasible points in mixed-integer \nlinear\, convex\, and nonconvex optimization. We also comment on the treatment of equality constraints and \non the integration of the granularity idea into branch-and-bound frameworks. \nThis presentation will take place via ZOOM. A link will be e-mailed prior to the event.
URL:https://alop.uni-trier.de/event/alop-kolloquium-with-oliver-stein-karlsruher-institut-fur-technologie-kit/
CATEGORIES:Colloquium
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